The CoralVue ABC Automated Testing Reagents are for the analysis of alkalinity, calcium, and magnesium levels. It can be used to manually test levels of kH, Ca, and Mg of aquarium water. Each kit has at least 240 alkalinity tests and 120 tests each of Calcium and Magnesium. Can be used instead of the Neptune Systems Trident Reagent Kit. Includes: Six bottles of Reagent A (changed every month); Three bottles of Reagent B (changed every two months); and Three bottles of Reagent C (changed every two months).